Can someone tell me why i get this when trying to use a loader?

Hi peeps i recently updated my wii and all was ok but when you try to use a loader i get a black screen with Exception (DSI) occered! stack dump: and code dump: any ideas? after reseting the wii a few times the loader will work but i have no idea whats causing it.I wanted to atach a pic of screen but file is to big.

Are you keeping your apps on sd card? If you are format the sd card, then extract the app pack directly to it.
Or if you are keeping them on your external hard drive, delete them all, then extract the app pack directly to it.